1. From the Applied Imaging Science Laboratory, Department of Radiology, Brigham and Women’s Hospital, 75 Francis St, Boston, MA 02115 (E.G., D.M.); 3D Medical Applications Center, Department of Radiology, Walter Reed National Military Medical Center, Bethesda, Md (P.L.); and Department of Radiology, University of Ottawa Faculty of Medicine and The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada (F.J.R.).